/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.hcatalog.data.transfer.state;

import java.text.NumberFormat;
import java.util.Random;

public class DefaultStateProvider implements StateProvider {

  /**
   * Default implementation. Here, ids are generated randomly.
   */
  @Override
  public int getId() {

    NumberFormat numberFormat = NumberFormat.getInstance();
    numberFormat.setMinimumIntegerDigits(5);
    numberFormat.setGroupingUsed(false);
    return Integer
        .parseInt(numberFormat.format(Math.abs(new Random().nextInt())));
  }

  private static StateProvider sp;

  public static synchronized StateProvider get() {
    if (null == sp) {
      sp = new DefaultStateProvider();
    }
    return sp;
  }
}